Ed
The measurements are close. I have been trying to find one just to see if it would fit. Machine work is one of my many hobbies. I have been contemplating machining a bracket that would pivot horizontally. It would be a a task to get it right.
Minn Kota has introduced a unit called Trim-N-Troll. It was previously made by Lenco. I understand there were some problems with the early Lenco units. I do not know that first hand. You do not see things like that in my part of the world.
Here is the link for the Minn Kota unit,
http://www.minnkotamotors.com/products/trimntroll/index.asp?lp=gb . The Minn Kota unit is pricey but you have you cake and can eat it too. You also end with with trim tabs. I feel more comfortable with Minn Kota behind it. Lenco still makes a similar unit with more elaborate steering. The Lenco unit is also much more expensive. I have seen the Minn Koka unit trade on eBay for around fourteen hundred. I guess if you figure you get trim tabs plus a trolling motor for the price it is easier to swallow. I bought one but have not received it yet. I will report how well it works after I have it installed and tried it out. It is the unit with 9"x11" trim tabs with two 24 volt, 80 lb thrust salt water motors. With some practice, you should be able to do anything with this that you do with a bow mount trolling motor. The question is how much battery life do you have? I have not had problems with batteries not lasting the day with any trolling motor I have ever used, assuming you have good batteries; however, I feel it would take more energy to pivot a boat from the stern rather than pulling it from the bow.
It will make my boat much more versatile and much easier to fish from, specially, the type fishing we do in Arkansas.
Grits